Not there yet myself but it is something that needs thinking about for all of us...
So a few thoughts-
Nuts are high in calories but very good for you so a handful of them a day would increase cals without bumping animal based fat intake up. Brazils are particularly good for selenium which our old pasture mineral specialist said was sadly lacking in our diets and at root of all sorts of ailments so good for health and good for weight maintenance.
Playing about with carb tolerance to see if weight loss has increased it. I'm not advocating a return to a carb fest but suggesting that you might be able to have another few chips with your tea( aimed particularly
@Bluetit1802 as I know you are already eating some spuds) , or adding a spoonful of chickpeas or other pulses to a dish. Play around with fruit as you might be able to manage more of it so could have that as a snack.
Have a starter - small bowl of homemade soup or some olives and salami , or a bit of homemade hummus if you can eat chickpeas ok with some veg sticks, garlic mushrooms, sliced smoked turkey ( Booths did a lovely one and I'm sure there's one in Clitheroe) with some crispy iceberg and bit of homemade french dressing, asparagus with butter or a soft boiled egg.
Or a dessert - or other low carb treat with a cuppa. Low carb cheesecake, crumbles, fruit and yogurt with some grated dark chocolate.
Bigger portions of low carb foods like broccoli and cabbage - not going to add too many extra carbs or cals but a few extra calories here and there might be just enough to keep you maintaining rather than losing. Try adding a small amount of butter to your veg if you don't mind the extra fat. Make a lovely olive oil dressing for your salads or homemade mayo.
I know from my Mum's experience that you don't need to go overboard and that eventually the body does find a status quo so that the losses stop. She probably eats more or less what she ate to lose weight most days but has a glass of wine a couple of nights a week and they always have a fancy Sunday evening meal with starter and pud, and that is enough to keep her in her range.